We do customized Designs, that is, a highly skilled & experienced Designer will take your requirements and make a Design for you. When you ask for modifications and changes, the Designer has to re-design and make changes as per the new inputs that you have given. This work costs us costly manpower and hence we charge you nominally for modifications. In most of the cases, modifications are not required due to site limitations, Vastu and design requirements, hence adding the cost of modification to the actual cost also would not make sense.